CSS -o- vendor extensions support in Opera Presto 2.10

The CSS specification allows for vendor-specific extensions. These are usually (but not exclusively) used for experimental additions to the CSS specification that have not yet reached Candidate Recommendation stage. The -o- prefix extension identifies an Opera experimental property or keyword.

Opera recommends that the final declaration of the property should be added to your style sheet if you use the unprefixed version. That way, future versions of the browser that include the feature after it becomes fully standardized can easily apply the style. See the following example.

-o-transform: scale(1.6);
transform: scale(1.6);

Recent changes:

CSS cursor values "zoom-in" and "zoom-out" are now supported without the Opera proprietary -o- prefix. Accordingly, they have been removed from the following Opera -o- prefix table.

Opera -o- vendor extensions

CSS3 Backgrounds and Borders Module Note: Opera only supports the border-image shorthand property with the use of the -o- prefix.

Yes

-o-device-pixel-ratio

Note: This property is not yet part of a W3C CSS working draft or recommendation. It determines the resolution of a device's screen, and describes the aspect ratio of the output device. This value consists of two positive integers separated by a slash ("/") character, and represents the number of horizontal pixels over the number of vertical pixels.